Madwifi 0.9.4.5 seems to work with this machine, but only after setting mode 2 with iwpriv. Module loads cleanly otherwise, but fails to associate with the network. We see several networks with NetworkManager, but cannot obtain an ip address from any of them.
To fix, modify modules.conf to set mode 2 after loading the module.
install ath_pci /sbin/modprobe --ignore-install ath_pci; /sbin/iwpriv ath0 mode 2
After this, we can associate. This also seems persistant across sleeps.
RPMS for 2.6.18-8.1.1.el5